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Cutaneous hyperpigmentation in Dogs

Author: Dr. med. vet. Gisa Löwe | Last modified: 07.02.2026

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HyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs is a skin change in which certain areas of the skin are darker than the surrounding skin. This excessive pigmentation can be triggered by various internal or external factors.

Can Occur with the Following Diseases:

Basics and possible causes

A dog’s skin contains melanocytes, specialized cells that produce melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration., the pigment responsible for coloring the skin, hair, and eyes. An increase in melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production or a proliferation of melanocytes can lead to hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. This is a process that can be influenced by hormonal changes, inflammatory conditions, and genetic predispositions.

One of the most common causes of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. is chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammation of the skin. This can be caused by allergies, infections, or irritations. When the skin is inflamed for an extended period, the melanocytes often react by producing more melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration., leading to a darker coloration of the affected skin areas.

Hormonal imbalances, such as those that occur in diseases like Cushing’s syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. or hypothyroidism, can also cause hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. These conditions affect the endocrine glands and can alter skin pigmentation by stimulating melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production.

Genetic factors also play a role. Certain dog breeds are more prone to hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. due to their genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases.. These include breeds such as the Dachshund, which are known for a predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. to skin problems.

Typical accompanying symptoms

Itching: Hyperpigmented skin areas can often be accompanied by itching, which may indicate an underlying inflammation or irritation.
Skin thickening: In addition to the darker coloration, the skin may also appear thickened or leathery, a condition known as lichenification.
Scaly skin: The affected skin areas can become dry and scaly, sometimes accompanied by a greasy or unpleasant odor.
Hair loss: In some cases, hair loss may occur in the hyperpigmented areas, exposing the underlying skin.
Redness and inflammation: Especially if the hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. is caused by an allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., redness and inflammation can occur.

When to visit the vet?

A visit to the vet is urgently required if the hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. occurs suddenly or worsens rapidly. This could indicate acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. inflammation or a systemic disease that requires immediate attention.

If the hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. is accompanied by severe itching, redness, or other skin changes, a veterinarian should also be consulted to determine the underlying cause and initiate appropriate treatments.

A vet visit is also advisable if the dog shows general symptoms of discomfort, such as lethargy, weight loss, or changes in appetite, as these may indicate a more comprehensive health problem.

Symptom recognition for animal owners and veterinary diagnostic procedures

The recognition of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. may initially be easy for the pet owner, as the dark skin areas are visible to the naked eye. However, it is important to identify the underlying cause in order to enable effective treatment.

The veterinarian will take a comprehensive medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and perform a physical examination. In doing so, he pays attention to other skin changes, the general condition of the coat and the behavior of the dog.

In addition, diagnostic tests such as skin biopsies, blood tests and hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. profiles can be carried out to rule out or confirm systemic diseases. These tests help to identify hormonal imbalances or infections that could be contributing to the hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors..

In some cases, an allergy testAn allergy test is a method for the diagnosis of allergic reactions. The body is exposed to various allergens to identify which substances trigger an allergic reaction. may also be necessary to determine whether an allergic reaction has caused the hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors..

What can pet owners do and professional therapy options

The pet owner can take some measures to alleviate the dog’s discomfort while waiting for a diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment by the veterinarian. This includes avoiding irritants that could worsen the skin problems, such as aggressive shampoos or chemicals.

It can be helpful to keep the dog’s skin clean and dry to avoid secondary infections. Regular bathing with a mild, hypoallergenic shampoo can help remove dirt and potential allergens.

Nutritional support in the form of dietary supplements containing omega-3 and omega-6 fatty acids can also promote skin health and reduce inflammation. However, these supplements should always be given in consultation with a veterinarian to ensure that they are suitable for the dog’s specific health condition.

It is important to prevent the dog from excessively licking or scratching the affected areas, as this could further damage the skin and lead to infections. A protective collar may be necessary in some cases to prevent this.

Outlook on current research

Current research in the field of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs focuses primarily on the genetic and environmental factors that lead to increased pigmentation of the skin. Scientists are investigating the role of melanocytes, the cells that produce melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration., and how genetic mutations or hormonal changes can affect their activity. Studies show that certain dog breeds are genetically predisposed to hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors., suggesting that genetic markers could be identified to determine the risk for this symptom early on.

Another focus of research is on identifying specific environmental factors that can triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. or worsen hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. This includes investigations into exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to UV radiation, the role of skin irritations and inflammation, and the effects of nutrition and grooming products. These studies aim to develop preventive measures that can reduce the occurrence or progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors..

In addition, intensive work is being carried out on the development of new diagnostic techniques. Researchers are using advanced imaging techniques and biochemical analyses to visualize changes in skin structure and pigment distribution. These technologies could enable earlier and more accurate detection of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in the future and help to identify the underlying causes.

There is also a growing interest in exploring treatment options for hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. While the use of topicalTopical refers to the direct application of medications or treatments to the skin or mucous membranes for a local effect, without being absorbed into the body. medications and therapies to regulate melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production is already practiced, scientists are working to develop new and more effective active ingredients. Natural substances and innovative biotechnological approaches are being investigated to find safer and more sustainable treatment methods.

Finally, researching the long-term effects of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. on the quality of life of dogs is an important aspect that has received little attention to date. Researchers are investigating how this symptom can affect the behavior and well-being of dogs in order to develop more comprehensive care approaches that take both physical and psychologicalPsychological refers to anything related to the mind or behavior. In veterinary medicine, this can include the study of animal behavior, including stress responses and behavioral disorders. aspects into account.

Frequently asked questions

What is hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs? HyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs refers to a darkening of the skin caused by an increased production of the pigment melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration.. This symptom can occur in certain areas of the skin and is often associated with other skin conditions.
Is hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs painful? HyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. itself is usually not painful. However, it can be associated with other skin problems that cause itching or discomfort. An accurate diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is important to treat the underlying problem.
Can all dog breeds develop hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.? Yes, all dog breeds can theoretically develop hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. However, some breeds are more susceptible to this symptom due to genetic factors. Certain breeds have a higher predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. for skin problems that can lead to hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors..
Which areas of the body are most commonly affected? Commonly affected areas include the armpits, abdomenThe abdomen, also known as the abdominal cavity, is the part of the body located between the rib cage and the pelvis. It houses several important organs, including the stomach, liver, kidneys, intestines, and spleen., groin, and skin folds. These areas are often sensitive to friction and moisture, which can promote the development of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors..
Can hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. be a sign of a serious illness? Yes, hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. can be a symptom of serious conditions such as hormonal disorders, allergies, or chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. skin inflammation. It is important to have the underlying cause clarified by a veterinarian.
How is hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. diagnosed? The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made through a combination of medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits., physical examination, and possibly skin biopsies. A veterinarian may also order blood tests to rule out hormonal or systemic diseases.
Are there home remedies for hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.? While some home remedies such as aloe vera or coconut oil can help soothe the skin, it is important to talk to a veterinarian before using them. Home remedies should not replace treatment by a professional.
Can diet affect hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.? Yes, nutrition can have an impact on skin health. A balanced diet with sufficient vitamins and minerals can help strengthen the skin barrier and reduce the risk of skin problems.
Is hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs curable? Healability depends on the underlying cause. Some forms of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. can be reversed by treating the triggering disease, while others may be permanent.
How can hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. be prevented in dogs? Preventive measures include regular skin care, avoiding irritants, and ensuring a balanced diet. Early veterinary examinations for skin changes can also help to detect and treat the problem early on.